Bonjour !
A = 2*5 + 2*x = 2(5 + x)
C = 14 - 7x = 7*2 - 7*x = 7(2 - x)
D = -20x - 5 = -5*4x - 5*1 = -5(4x + 1)
F = x² + x = x*x +x*1 = x(x + 1)
H = -x² + 2x = -x*x + x*2 = x(-x + 2)
K = -7x² - 12x = -x*7x - x*12 = -x(7x + 12)
J'espère t'avoir aidé. Bon courage !
